In the question, we are told that Graham borrowed $10 from his mum to buy a toy. He pays back his mum $2 per week from his allowance. We can find how long will it take for him to pay her below.
Explanation
Since Graham is paying back every week, this means that the payback time would be measured in weeks.
We can use the formula below;
[tex]\text{Pay back time(w}eeks\text{)=}\frac{\text{Total amount borrowed}}{\text{payment per w}eek}[/tex]
Thus;
[tex]\text{Pay back time(w}eeks\text{)}=\frac{10}{2}=5weeks[/tex]
Answer: 5 weeks
